var pubsub = (() => {
	var topics = {};

	function subscribe(topic, fn) {
		if (!topics[topic]) {
			topics[topic] = [];
		}
		topics[topic].push(fn);
	}

	function publish(topic, ...args) {
		if (!topics[topic])
			return;
		for (let fn of topics[topic]) {
			fn(...args);
		}
	}
	return {
		subscribe,
		publish
	}
})()
pubsub.subscribe('test', function(a, b) { //订阅者A订阅了test事件
	console.log(a, b);
});
pubsub.publish('test', '123', 'HH'); //123  HH（发布者B发布了test事件）
